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For the Inventor, By the Inventor

Vaasa, Finland

Oy Kwh Pipe Ab


USPTO Granted Patents = 15

% Expired Patents = 40.0



Trademarks = 1

Forward Citations = 159

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17 inventors (with patents filed for the assignee):

goldMedal Gunnar Blomqvist (7 out of 9 patents)

silverMedal Stefan Slotte (4 out of 4 patents)

bronzeMedal Sven Sjöberg (3 out of 5 patents)

4.  Charlotta Risku (2 out of 2 patents)

5.  Jonas Holmlund (2 out of 2 patents)

6.  Seppo Takala (2 out of 2 patents)

7.  Anders Andtbacka (2 out of 2 patents)

8.  Jouni Purmonen (1 out of 11 patents)

9.  Leif Leiden (1 out of 13 patents)

10.  Sven Sjoberg (1 out of 3 patents)

11.  Patrick Jansson (1 out of 1 patent)

12.  Christian Vestman (1 out of 1 patent)

13.  Mikael Finne (1 out of 1 patent)

14.  Leif Leidén (1 out of 1 patent)

15.  Rauno Smått (1 out of 2 patents)


15 patents:

1. 9186838 - Apparatus and method for coating pipes or pipe sections (2015-11-17),
2. 8701714 - Multiple layer pipe (2014-04-22),
3. 8663767 - Hollow profile used in the manufacture of a pipe (2014-03-04),
4. 8568830 - Method for manufacturing coated pipes (2013-10-29),
5. 8474401 - Method and apparatus for coating pipes (2013-07-02),
6. 8062013 - Device for internal cooling of extruded thermoplastics pipes (2011-11-22),
7. 7770604 - Hollow profile used in the manufacture of a pipe (2010-08-10),
8. 7347910 - Method for manufacturing a container end wall of lightweight construction and a container provided with such an end wall (2008-03-25),
9. 6939424 - Method of making a spirally-wound tube (2005-09-06),
10. 6666945 - Preparation of an end of a thermoplastics tube manufactured by spirally winding a hollow profile (2003-12-23),
11. 6322653 - Method for joining spiral wound pipes (2001-11-27),
12. 5591292 - Welding method in the manufacture of a spirally wound tube and a welding (1997-01-07),
13. 5431762 - Method for joining spirally wound thermoplastic pipes together (1995-07-11),
14. 5411619 - Method for manufacturing a joint pipe (1995-05-02),
15. 5127442 - Plastic tube formed by spiral winding of hollow section (1992-07-07),
Company Overview
Oy Kwh Pipe Ab is a Finnish company based in Vaasa, specializing in the development and manufacturing of advanced piping systems and solutions. The organization focuses on providing high-quality products for various industries, including energy, water, and construction. With a commitment to innovation, Oy Kwh Pipe Ab leverages cutting-edge technology to enhance the efficiency and sustainability of its offerings, catering to both domestic and international markets. The company emphasizes reliability and performance in its product lines.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

15 Patents

#4 in Vaasa

#219 in Finland

#39,921 in the World

Vaasa, FI
Vaasa, Finland

Oy Kwh Pipe Ab

Forward Citations = 159

17 inventors:

goldMedal Gunnar Blomqvist (7 out of 9 patents)

silverMedal Stefan Slotte (4 out of 4 patents)

bronzeMedal Sven Sjöberg (3 out of 5 patents)

4.  Charlotta Risku (2 out of 2 patents)

5.  Jonas Holmlund (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Oy Kwh Pipe Ab. Retrieved from https://idiyas.com/company/oy-kwh-pipe-ab

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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